Here's my similar build which I made a few years ago, and still using it on (almost)daily basis(as you can see, they are pretty dusty ).The switch in the middle of the block change the voltage of all four fans, between 7.5/15V(the fans are connected in two groups, each group with two fans in parallel; the switch change between the parallel/serial mode of the groups to 15V); the on/off switch is on the cable.The power block(15V/3A) is from an old laptop, the fans(120X120X38mm) are coming from old rear-projection LCD TV's.At 15V, it sound like hurricane, as expected, but it moves a LOTS of air; at 7.5V is pretty much silent.The the fans are most efficient(move the most amount of air) mounted on a stand away(>10") from all surfaces, standing on surface(desk) are not that efficient.If I would build a similar unit today, I would use Scythe Kaze Ultra 3000RPM fans, and I would build on a speaker stand with weight at the bottom, and OC, use the half/full switch. As power supply, I would use a 12-15V/3-5A brick.

Heck, you might try the one I linked. Claims to be as quiet as a desktop pc Instead of really loud fan to exhaust the smoke, use a quieter one to filter the crap out.

If you go the build a fan route: Consider looking through your pile of no longer used wall warts. Find one that has 9V or 12V DC out at enough mA to run your four fans. (Should be in the fan's spec). Get a Fan Mate 2 to dial in the rpm/noise and go MacGyver it together.

wall wart output -> fan mate -> 4 fans.

Scythe Kama Flow 120mm show 0.3A @ 12V. Then again, that's $60 for the fans, $9 for the fanmate 2. So $70 plus a wall wart that can put out 1.2A.

I really think you ought to look for one of those specialized smoke filtration dealies that can sit next to the ashtray. Solve the problem at the source. Or het some nicorette gum

They do make external 4 pin power supplies, you see them sometimes for external hard drive setups. Here's one I found with a basic google search: http://www.ebay.com/itm/External-Power-Supply-12V-DC-4-Pin-Molex-Adapter-Cable-/360170366699One of those would be the obvious way to go, with a fan controller in the middle, of course. But a dc supply from someplace might also work, if you're willing to do some wiring. As far as the big fans go, I've tried a few and most aren't completely quiet at full speed, I'd definitely go with fan control to keep it as quiet as you like. A block of four may be more flexible, but I'm not sure if it would move more or less air than a single big fan. Eh, could try both ways and see. Have fun!

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